Respuesta :

musiclover10045
y *x =20

y +x =9

rewrite 1st eq. as y = 20/x

subsituute that into 2nd eq.

20/x +x =9

multiply each term by X

20 +x^2 = 9x
 subtract 9x from each side:

x^2 - 9x +20 = 0

now factor:

(x-5) (x-4) = 0

solve for x
5-5 = 0
 4-4 = 0

so X can be 4 or 5

replace x into equations and solve for Y

 so when X = 4, Y = 5
 When X = 5, Y = 4

x= 5,4
y = 4,5



TobeySnaps

Hey there!


You said,

What number does y equal?

Y equals 4,5

What number does x equal?

X equals 5,4


They both have variables on  same side, so you can rearrange the equation, or solving for either x or y, and start substituting. Thats how i got the answers.



Hope this helped you. :D

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